Welcome to the forum.

The best current reference to S&W revolvers is the Standard Catalog of Smith & Wesson by Supica and Nahas. It's available through Amazon. There are also other printed S&W histories, like The History of Smith & Wesson by Neal and Jinks.

You may well be right in your identification. The .32 Double Action top breaks were manufactured between 1880 and about 1920. The serial number you quote lies in the range associated with the fourth model, which was in production from 1883 to 1909. By interpolation, your serial number would fall around 1884-85. Your gun very well could be about 125 years old.

Guns do survive from the late 19th century in surprisingly good condition. Sounds like you may have one of them. Congratulations.

Any chance you could post a picture or two? That would help confirm the suspected identification.

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David Wilson